netdev - Re: [PATCH] ip: mpls: fix printing of mpls labels

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Date:   Thu, 11 May 2017 13:52:47 -0700
From:   David Ahern <dsahern@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com
Subject: Re: [PATCH] ip: mpls: fix printing of mpls labels

On 5/11/17 11:09 AM, Stephen Hemminger wrote:
> On Mon,  8 May 2017 23:04:13 -0700
> David Ahern <dsahern@...il.com> wrote:
> 
>> If the kernel returns more labels than iproute2 expects, none of
>> the labels are printed and (null) is shown instead:
>>     $ ip -f mpls ro ls
>>     101 as to (null) via inet 172.16.2.2 dev virt12
>>     201 as to 202/203 via inet6 2001:db8:2::2 dev virt12
>>
>> Remove the use of MPLS_MAX_LABELS and rely on buffer length that is
>> passed to mpls_ntop. With this change ip can print the label stack
>> returned by the kernel up to 255 characters (limit is due to size of
>> buf passed in) which amounts to 31 labels with a separator.
>>
>> With this change the above is:
>>     $ ip/ip -f mpls ro ls
>>     101 as to 102/103/104/105/106/107/108/109/110 via inet 172.16.2.2 dev virt12
>>
>> Signed-off-by: David Ahern <dsahern@...il.com>
> 
> Much better. Applied thanks.
> 

This is only one-half of the solution; the install side is harder. I'll
send something in the next few days.